Android实现zip文件压缩及解压缩的方法
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2022-06-29 09:19:21
本文实例讲述了android实现zip文件压缩及解压缩的方法。分享给大家供大家参考。具体如下:
dirtraversal.java如下:
package com...
本文实例讲述了android实现zip文件压缩及解压缩的方法。分享给大家供大家参考。具体如下:
dirtraversal.java如下:
package com.once; import java.io.file; import java.util.arraylist; import java.util.linkedlist; /** * 文件夹遍历 * @author once * */ public class dirtraversal { //no recursion public static linkedlist<file> listlinkedfiles(string strpath) { linkedlist<file> list = new linkedlist<file>(); file dir = new file(strpath); file file[] = dir.listfiles(); for (int i = 0; i < file.length; i++) { if (file[i].isdirectory()) list.add(file[i]); else system.out.println(file[i].getabsolutepath()); } file tmp; while (!list.isempty()) { tmp = (file) list.removefirst(); if (tmp.isdirectory()) { file = tmp.listfiles(); if (file == null) continue; for (int i = 0; i < file.length; i++) { if (file[i].isdirectory()) list.add(file[i]); else system.out.println(file[i].getabsolutepath()); } } else { system.out.println(tmp.getabsolutepath()); } } return list; } //recursion public static arraylist<file> listfiles(string strpath) { return refreshfilelist(strpath); } public static arraylist<file> refreshfilelist(string strpath) { arraylist<file> filelist = new arraylist<file>(); file dir = new file(strpath); file[] files = dir.listfiles(); if (files == null) return null; for (int i = 0; i < files.length; i++) { if (files[i].isdirectory()) { refreshfilelist(files[i].getabsolutepath()); } else { if(files[i].getname().tolowercase().endswith("zip")) filelist.add(files[i]); } } return filelist; } }
ziputils.java如下:
package com.once; import java.io.*; import java.util.arraylist; import java.util.collection; import java.util.enumeration; import java.util.zip.zipentry; import java.util.zip.zipexception; import java.util.zip.zipfile; import java.util.zip.zipoutputstream; /** * java utils 实现的zip工具 * * @author once */ public class ziputils { private static final int buff_size = 1024 * 1024; // 1m byte /** * 批量压缩文件(夹) * * @param resfilelist 要压缩的文件(夹)列表 * @param zipfile 生成的压缩文件 * @throws ioexception 当压缩过程出错时抛出 */ public static void zipfiles(collection<file> resfilelist, file zipfile) throws ioexception { zipoutputstream zipout = new zipoutputstream(new bufferedoutputstream(new fileoutputstream( zipfile), buff_size)); for (file resfile : resfilelist) { zipfile(resfile, zipout, ""); } zipout.close(); } /** * 批量压缩文件(夹) * * @param resfilelist 要压缩的文件(夹)列表 * @param zipfile 生成的压缩文件 * @param comment 压缩文件的注释 * @throws ioexception 当压缩过程出错时抛出 */ public static void zipfiles(collection<file> resfilelist, file zipfile, string comment) throws ioexception { zipoutputstream zipout = new zipoutputstream(new bufferedoutputstream(new fileoutputstream( zipfile), buff_size)); for (file resfile : resfilelist) { zipfile(resfile, zipout, ""); } zipout.setcomment(comment); zipout.close(); } /** * 解压缩一个文件 * * @param zipfile 压缩文件 * @param folderpath 解压缩的目标目录 * @throws ioexception 当解压缩过程出错时抛出 */ public static void upzipfile(file zipfile, string folderpath) throws zipexception, ioexception { file desdir = new file(folderpath); if (!desdir.exists()) { desdir.mkdirs(); } zipfile zf = new zipfile(zipfile); for (enumeration<?> entries = zf.entries(); entries.hasmoreelements();) { zipentry entry = ((zipentry)entries.nextelement()); inputstream in = zf.getinputstream(entry); string str = folderpath + file.separator + entry.getname(); str = new string(str.getbytes("8859_1"), "gb2312"); file desfile = new file(str); if (!desfile.exists()) { file fileparentdir = desfile.getparentfile(); if (!fileparentdir.exists()) { fileparentdir.mkdirs(); } desfile.createnewfile(); } outputstream out = new fileoutputstream(desfile); byte buffer[] = new byte[buff_size]; int reallength; while ((reallength = in.read(buffer)) > 0) { out.write(buffer, 0, reallength); } in.close(); out.close(); } } /** * 解压文件名包含传入文字的文件 * * @param zipfile 压缩文件 * @param folderpath 目标文件夹 * @param namecontains 传入的文件匹配名 * @throws zipexception 压缩格式有误时抛出 * @throws ioexception io错误时抛出 */ public static arraylist<file> upzipselectedfile(file zipfile, string folderpath, string namecontains) throws zipexception, ioexception { arraylist<file> filelist = new arraylist<file>(); file desdir = new file(folderpath); if (!desdir.exists()) { desdir.mkdir(); } zipfile zf = new zipfile(zipfile); for (enumeration<?> entries = zf.entries(); entries.hasmoreelements();) { zipentry entry = ((zipentry)entries.nextelement()); if (entry.getname().contains(namecontains)) { inputstream in = zf.getinputstream(entry); string str = folderpath + file.separator + entry.getname(); str = new string(str.getbytes("8859_1"), "gb2312"); // str.getbytes("gb2312"),"8859_1" 输出 // str.getbytes("8859_1"),"gb2312" 输入 file desfile = new file(str); if (!desfile.exists()) { file fileparentdir = desfile.getparentfile(); if (!fileparentdir.exists()) { fileparentdir.mkdirs(); } desfile.createnewfile(); } outputstream out = new fileoutputstream(desfile); byte buffer[] = new byte[buff_size]; int reallength; while ((reallength = in.read(buffer)) > 0) { out.write(buffer, 0, reallength); } in.close(); out.close(); filelist.add(desfile); } } return filelist; } /** * 获得压缩文件内文件列表 * * @param zipfile 压缩文件 * @return 压缩文件内文件名称 * @throws zipexception 压缩文件格式有误时抛出 * @throws ioexception 当解压缩过程出错时抛出 */ public static arraylist<string> getentriesnames(file zipfile) throws zipexception, ioexception { arraylist<string> entrynames = new arraylist<string>(); enumeration<?> entries = getentriesenumeration(zipfile); while (entries.hasmoreelements()) { zipentry entry = ((zipentry)entries.nextelement()); entrynames.add(new string(getentryname(entry).getbytes("gb2312"), "8859_1")); } return entrynames; } /** * 获得压缩文件内压缩文件对象以取得其属性 * * @param zipfile 压缩文件 * @return 返回一个压缩文件列表 * @throws zipexception 压缩文件格式有误时抛出 * @throws ioexception io操作有误时抛出 */ public static enumeration<?> getentriesenumeration(file zipfile) throws zipexception, ioexception { zipfile zf = new zipfile(zipfile); return zf.entries(); } /** * 取得压缩文件对象的注释 * * @param entry 压缩文件对象 * @return 压缩文件对象的注释 * @throws unsupportedencodingexception */ public static string getentrycomment(zipentry entry) throws unsupportedencodingexception { return new string(entry.getcomment().getbytes("gb2312"), "8859_1"); } /** * 取得压缩文件对象的名称 * * @param entry 压缩文件对象 * @return 压缩文件对象的名称 * @throws unsupportedencodingexception */ public static string getentryname(zipentry entry) throws unsupportedencodingexception { return new string(entry.getname().getbytes("gb2312"), "8859_1"); } /** * 压缩文件 * * @param resfile 需要压缩的文件(夹) * @param zipout 压缩的目的文件 * @param rootpath 压缩的文件路径 * @throws filenotfoundexception 找不到文件时抛出 * @throws ioexception 当压缩过程出错时抛出 */ private static void zipfile(file resfile, zipoutputstream zipout, string rootpath) throws filenotfoundexception, ioexception { rootpath = rootpath + (rootpath.trim().length() == 0 ? "" : file.separator) + resfile.getname(); rootpath = new string(rootpath.getbytes("8859_1"), "gb2312"); if (resfile.isdirectory()) { file[] filelist = resfile.listfiles(); for (file file : filelist) { zipfile(file, zipout, rootpath); } } else { byte buffer[] = new byte[buff_size]; bufferedinputstream in = new bufferedinputstream(new fileinputstream(resfile), buff_size); zipout.putnextentry(new zipentry(rootpath)); int reallength; while ((reallength = in.read(buffer)) != -1) { zipout.write(buffer, 0, reallength); } in.close(); zipout.flush(); zipout.closeentry(); } } }
希望本文所述对大家的android程序设计有所帮助。
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